Dogcows Code - chaz/openbox/blob - render/color.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    color.c for the Openbox window manager
   4    Copyright (c) 2006        Mikael Magnusson
   5    Copyright (c) 2003        Ben Jansens
   6    Copyright (c) 2003        Derek Foreman
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    See the COPYING file for a copy of the GNU General Public License.
  19 */
  20
  21 #include "render.h"
  22 #include "color.h"
  23 #include "instance.h"
  24
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <string.h>
  28
  29 void RrColorAllocateGC(RrColor *in)
  30 {
  31     XGCValues gcv;
  32
  33     gcv.foreground = in->pixel;
  34     gcv.cap_style = CapProjecting;
  35     in->gc = XCreateGC(RrDisplay(in->inst),
  36                        RrRootWindow(in->inst),
  37                        GCForeground | GCCapStyle, &gcv);
  38 }
  39
  40 RrColor *RrColorParse(const RrInstance *inst, gchar *colorname)
  41 {
  42     XColor xcol;
  43
  44     g_assert(colorname != NULL);
  45     /* get rgb values from colorname */
  46
  47     xcol.red = 0;
  48     xcol.green = 0;
  49     xcol.blue = 0;
  50     xcol.pixel = 0;
  51     if (!XParseColor(RrDisplay(inst), RrColormap(inst), colorname, &xcol)) {
  52         g_warning("unable to parse color '%s'", colorname);
  53         return NULL;
  54     }
  55     return RrColorNew(inst, xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8);
  56 }
  57
  58 /*#define NO_COLOR_CACHE*/
  59 #ifdef DEBUG
  60 gint id;
  61 #endif
  62
  63 RrColor *RrColorNew(const RrInstance *inst, gint r, gint g, gint b)
  64 {
  65     /* this should be replaced with something far cooler */
  66     RrColor *out = NULL;
  67     XColor xcol;
  68     gint key;
  69
  70     g_assert(r >= 0 && r < 256);
  71     g_assert(g >= 0 && g < 256);
  72     g_assert(b >= 0 && b < 256);
  73
  74     key = (r << 24) + (g << 16) + (b << 8);
  75 #ifndef NO_COLOR_CACHE
  76     if ((out = g_hash_table_lookup(RrColorHash(inst), &key))) {
  77         out->refcount++;
  78     } else {
  79 #endif
  80         xcol.red = (r << 8) | r;
  81         xcol.green = (g << 8) | g;
  82         xcol.blue = (b << 8) | b;
  83         if (XAllocColor(RrDisplay(inst), RrColormap(inst), &xcol)) {
  84             out = g_new(RrColor, 1);
  85             out->inst = inst;
  86             out->r = xcol.red >> 8;
  87             out->g = xcol.green >> 8;
  88             out->b = xcol.blue >> 8;
  89             out->gc = None;
  90             out->pixel = xcol.pixel;
  91             out->key = key;
  92             out->refcount = 1;
  93 #ifdef DEBUG
  94             out->id = id++;
  95 #endif
  96 #ifndef NO_COLOR_CACHE
  97             g_hash_table_insert(RrColorHash(inst), &out->key, out);
  98         }
  99 #endif
 100     }
 101     return out;
 102 }
 103
 104 void RrColorFree(RrColor *c)
 105 {
 106     if (c) {
 107         if (--c->refcount < 1) {
 108 #ifndef NO_COLOR_CACHE
 109             g_assert(g_hash_table_lookup(RrColorHash(c->inst), &c->key));
 110             g_hash_table_remove(RrColorHash(c->inst), &c->key);
 111 #endif
 112             if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
 113                                       &c->pixel, 1, 0);
 114             if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
 115             g_free(c);
 116         }
 117     }
 118 }
 119
 120 void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 121 {
 122     gint r, g, b;
 123     gint x,y;
 124     RrPixel32 *p32 = (RrPixel32 *) im->data;
 125     RrPixel16 *p16 = (RrPixel16 *) im->data;
 126     guchar *p8 = (guchar *)im->data;
 127     switch (im->bits_per_pixel) {
 128     case 32:
 129         if ((RrRedOffset(inst) != RrDefaultRedOffset) ||
 130             (RrBlueOffset(inst) != RrDefaultBlueOffset) ||
 131             (RrGreenOffset(inst) != RrDefaultGreenOffset)) {
 132             for (y = 0; y < im->height; y++) {
 133                 for (x = 0; x < im->width; x++) {
 134                     r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 135                     g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 136                     b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 137                     p32[x] = (r << RrRedOffset(inst))
 138                            + (g << RrGreenOffset(inst))
 139                            + (b << RrBlueOffset(inst));
 140                 }
 141                 data += im->width;
 142                 p32 += im->width;
 143             }
 144         } else im->data = (gchar*) data;
 145         break;
 146     case 16:
 147         for (y = 0; y < im->height; y++) {
 148             for (x = 0; x < im->width; x++) {
 149                 r = (data[x] >> RrDefaultRedOffset) & 0xFF;
 150                 r = r >> RrRedShift(inst);
 151                 g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
 152                 g = g >> RrGreenShift(inst);
 153                 b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
 154                 b = b >> RrBlueShift(inst);
 155                 p16[x] = (r << RrRedOffset(inst))
 156                        + (g << RrGreenOffset(inst))
 157                        + (b << RrBlueOffset(inst));
 158             }
 159             data += im->width;
 160             p16 += im->bytes_per_line/2;
 161         }
 162         break;
 163     case 8:
 164         g_assert(RrVisual(inst)->class != TrueColor);
 165         for (y = 0; y < im->height; y++) {
 166             for (x = 0; x < im->width; x++) {
 167                 p8[x] = RrPickColor(inst,
 168                                     data[x] >> RrDefaultRedOffset,
 169                                     data[x] >> RrDefaultGreenOffset,
 170                                     data[x] >> RrDefaultBlueOffset)->pixel;
 171             }
 172             data += im->width;
 173             p8 += im->bytes_per_line;
 174         }
 175         break;
 176     default:
 177         g_warning("your bit depth is currently unhandled\n");
 178     }
 179 }
 180
 181 XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
 182 {
 183   r = (r & 0xff) >> (8-RrPseudoBPC(inst));
 184   g = (g & 0xff) >> (8-RrPseudoBPC(inst));
 185   b = (b & 0xff) >> (8-RrPseudoBPC(inst));
 186   return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
 187                                (g << (1*RrPseudoBPC(inst))) +
 188                                b];
 189 }
 190
 191 static void swap_byte_order(XImage *im)
 192 {
 193     gint x, y, di;
 194
 195     di = 0;
 196     for (y = 0; y < im->height; ++y) {
 197         for (x = 0; x < im->height; ++x) {
 198             gchar *c = &im->data[di + x * im->bits_per_pixel / 8];
 199             gchar t;
 200
 201             switch (im->bits_per_pixel) {
 202             case 32:
 203                 t = c[2];
 204                 c[2] = c[3];
 205                 c[3] = t;
 206             case 16:
 207                 t = c[0];
 208                 c[0] = c[1];
 209                 c[1] = t;
 210             case 8:
 211             case 1:
 212                 break;
 213             default:
 214                 g_warning("Your bit depth is currently unhandled");
 215             }
 216         }
 217         di += im->bytes_per_line;
 218     }
 219
 220     if (im->byte_order == LSBFirst)
 221         im->byte_order = MSBFirst;
 222     else
 223         im->byte_order = LSBFirst;
 224 }
 225
 226 void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
 227 {
 228     gint r, g, b;
 229     gint x,y;
 230     RrPixel32 *p32 = (RrPixel32 *) im->data;
 231     RrPixel16 *p16 = (RrPixel16 *) im->data;
 232     guchar *p8 = (guchar *)im->data;
 233
 234     if (im->byte_order != LSBFirst)
 235         swap_byte_order(im);
 236
 237     switch (im->bits_per_pixel) {
 238     case 32:
 239         for (y = 0; y < im->height; y++) {
 240             for (x = 0; x < im->width; x++) {
 241                 r = (p32[x] >> RrRedOffset(inst)) & 0xff;
 242                 g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
 243                 b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
 244                 data[x] = (r << RrDefaultRedOffset)
 245                     + (g << RrDefaultGreenOffset)
 246                     + (b << RrDefaultBlueOffset)
 247                     + (0xff << RrDefaultAlphaOffset);
 248             }
 249             data += im->width;
 250             p32 += im->bytes_per_line/4;
 251         }
 252         break;
 253     case 16:
 254         for (y = 0; y < im->height; y++) {
 255             for (x = 0; x < im->width; x++) {
 256                 r = (p16[x] & RrRedMask(inst)) >>
 257                     RrRedOffset(inst) <<
 258                     RrRedShift(inst);
 259                 g = (p16[x] & RrGreenMask(inst)) >>
 260                     RrGreenOffset(inst) <<
 261                     RrGreenShift(inst);
 262                 b = (p16[x] & RrBlueMask(inst)) >>
 263                     RrBlueOffset(inst) <<
 264                     RrBlueShift(inst);
 265                 data[x] = (r << RrDefaultRedOffset)
 266                     + (g << RrDefaultGreenOffset)
 267                     + (b << RrDefaultBlueOffset)
 268                     + (0xff << RrDefaultAlphaOffset);
 269             }
 270             data += im->width;
 271             p16 += im->bytes_per_line/2;
 272         }
 273         break;
 274     case 8:
 275         g_warning("this image bit depth is currently unhandled");
 276         break;
 277     case 1:
 278         for (y = 0; y < im->height; y++) {
 279             for (x = 0; x < im->width; x++) {
 280                 if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
 281                     data[x] = 0xff << RrDefaultAlphaOffset; /* black */
 282                 else
 283                     data[x] = 0xffffffff; /* white */
 284             }
 285             data += im->width;
 286             p8 += im->bytes_per_line;
 287         }
 288         break;
 289     default:
 290         g_warning("this image bit depth is currently unhandled");
 291     }
 292 }
 293
 294 gint RrColorRed(const RrColor *c)
 295 {
 296     return c->r;
 297 }
 298
 299 gint RrColorGreen(const RrColor *c)
 300 {
 301     return c->g;
 302 }
 303
 304 gint RrColorBlue(const RrColor *c)
 305 {
 306     return c->b;
 307 }
 308
 309 gulong RrColorPixel(const RrColor *c)
 310 {
 311     return c->pixel;
 312 }
 313
 314 GC RrColorGC(RrColor *c)
 315 {
 316     if (!c->gc)
 317         RrColorAllocateGC(c);
 318     return c->gc;
 319 }